| 引用本文: | 解北京,栾铮,李晓旭,张景顺,于瑞星,丁浩.三维动静加载下煤的本构模型及卸荷破坏特征[J].哈尔滨工业大学学报,2024,56(4):61.DOI:10.11918/202301054 |
| XIE Beijing,LUAN Zheng,LI Xiaoxu,ZHANG Jingshun,YU Ruixing,DING Hao.Constitutive model and unloading failure characteristics of coal under 3D coupled static and dynamic loads[J].Journal of Harbin Institute of Technology,2024,56(4):61.DOI:10.11918/202301054 |
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| 三维动静加载下煤的本构模型及卸荷破坏特征 |
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解北京,栾铮,李晓旭,张景顺,于瑞星,丁浩
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(中国矿业大学(北京) 应急管理与安全工程学院,北京 100083)
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| 摘要: |
| 为研究非静水压条件下煤体动力学性能及动力扰动后卸荷破坏特征,在三维动静加载实验的基础上,研究了卸荷方式对动力扰动后卸荷煤样宏观破坏特性的影响。首先,采用Ф50 mm的分离式霍普金森压杆系统,开展三维动静加载下煤样的动力学实验,研究轴压、应变率对煤样动力学响应规律的影响；其次,基于响应曲面理论,借助中心复合试验法,构建考虑因素交互作用的回归模型,并分析单因素及因素交互作用的显著性；然后,结合因素交互作用、Weibull分布、Drucker-Prager准则,修正煤的强度型统计损伤本构模型,对比理论与实验结果,验证模型可靠性；最后,借助加卸荷电液伺服装置,探究轴压、冲击气压、卸荷方式对煤样破坏特征的影响及作用机制。结果表明,构建的强度型统计损伤模型,相关系数R2≥0.88,可表征煤样动力学响应行为。冲击后同步卸荷的煤样多呈层裂破坏,拉伸界面随轴压增大而后移直至消失,无法形成层裂破坏；非同步卸荷下煤样破坏形式主要包括整体完整、层裂、压剪破坏,而当冲击气压0.4~0.6 MPa,轴压14.5 MPa时,表现为“层裂+压剪”混合破坏。 |
| 关键词: 动静组合 卸荷破坏 本构模型 分离式霍普金森压杆 响应曲面法 交互作用 |
| DOI：10.11918/202301054 |
| 分类号:TU452 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2022YFC2904100)；中央高校基本科研业务费专项资金(2023ZKPYAQ04) |
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| Constitutive model and unloading failure characteristics of coal under 3D coupled static and dynamic loads |
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XIE Beijing,LUAN Zheng,LI Xiaoxu,ZHANG Jingshun,YU Ruixing,DING Hao
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(School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)
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| Abstract: |
| To investigate the dynamic performance and unloading failure characteristics of coal under non-hydrostatic conditions, based on 3D dynamic and static loading experiment, the effect of unloading method on the macroscopic failure characteristics of unloading coal samples after dynamic disturbance was studied. Firstly, Ф50 mm split Hopkinson pressure bar system was used to carry out the dynamic experiment of coal sample under 3D dynamic and static loading for the purpose of studying the influence of axial compression and strain rate on the dynamic response of coal samples. Secondly, based on the response surface theory, a regression model considering the interaction of factors was constructed by using the central composite test method and the significance of single factor and factor interaction were analyzed. Afterwards, combined with factor interaction, Weibull distribution and Drucker-Prager criterion, the strength statistical damage constitutive model of coal was modified. The reliability of the model was verified by comparing the theoretical and experimental results. Finally, with the help of loading and unloading electro-hydraulic servo device, the influence and mechanism of axial pressure, impact pressure and unloading mode on the failure characteristics of coal samples were explored. The results showed that the constructed strength statistical damage model has a correlation coefficient R2≥0.88, which can characterize the dynamic response behavior of coal samples. The coal samples with synchronous unloading after impact are mostly spalled, and the tensile interface moves backward and eventually disappears with the increase of axial pressure, unable to form spall failure. The failure modes of coal samples under non-synchronous unloading mainly include overall integrity, spalling and compression-shear failure. However, when the impact pressure is in the range of 0.4 to 0.6 MPa and the axial pressure is 14.5 MPa, a mixed failure mode of ‘spalling + compression-shear’ is observed. |
| Key words: dynamic static combination unloading failure constitutive model split Hopkinson pressure bar(SHPB) response surface method interaction |
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